Honkai: Star Rail Dr. Ratio Build Guide: Light Cones, Relics, Best Teams

Alexa Hunter

Mar 17, 2026

Dr. Ratio is a 5-star Imaginary character following the path of The Hunt in Honkai: Star Rail. As a powerful single-target DPS, Dr. Ratio specializes in dealing high damage through his Follow-Up Attacks that are triggered when enemies are affected by debuffs. To maximize Dr. Ratio’s potential, proper team composition and build optimization are essential. In this Dr. Ratio build guide, we will cover his best Light Cones, recommended relic sets, optimal planar ornaments, and trace priority to help you fully utilize his debuff-based mechanics and maximize his overall damage output.

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Dr. Ratio Character Overview

Dr. Ratio Information

Character Information
	Rarity	★★★★★
	Element	Imaginary
	Path	Hunt
	Combat Role	Main DPS

Dr. Ratio Gameplay

Dr. Ratio is a 5-star Imaginary Hunt DPS who excels at dealing consistent single-target damage through his Follow-Up Attack mechanics. His Skill deals Imaginary DMG to a single enemy while applying a debuff that increases the likelihood of triggering his Talent. Whenever an enemy affected by debuffs is attacked by Dr. Ratio, his Talent gives him a chance to launch an additional Follow-Up Attack that deals significant Imaginary damage. This core mechanic encourages teams to apply multiple debuffs to enemies, allowing Dr. Ratio to consistently trigger his Follow-Up Attacks and maintain a steady stream of damage throughout battle.

His combat potential heavily revolves around maximizing the number of debuffs applied to enemies. The more debuffs present on a target, the higher the probability that his Talent will activate its Follow-Up Attack. This makes him synergize extremely well with debuff-focused characters who can consistently apply status effects during combat. His Ultimate further enhances his offensive capabilities by dealing high Imaginary damage to a single target while marking them, increasing the damage of his Follow-Up Attacks against that enemy and allowing him to capitalize on his Talent more effectively.

Dr. Ratio’s passive Traces further strengthen his damage output and reliability during battle. His A2 Trace increases his CRIT Rate when attacking enemies with multiple debuffs, rewarding teams that fully utilize his debuff-based playstyle. His A4 Trace improves the damage dealt by his Follow-Up Attacks, allowing his Talent to contribute even more to his overall DPS. Finally, his A6 Trace boosts his CRIT DMG when attacking enemies affected by debuffs, significantly increasing his burst potential and ensuring that his Follow-Up Attacks hit as hard as possible when the conditions are met.

Dr. Ratio Trace Priority

Trace	Priority
Talent	★★★★★ (Top)
Skill	★★★★★ (Top)
Ultimate	★★★★ (High)
Basic Attack	★ (Low)

Dr. Ratio's Talent and Skill are the top priorities, as they define his core damage output and Follow-Up Attack mechanics. His Skill deals strong single-target Imaginary damage while helping set up the conditions needed to trigger his Talent. Meanwhile, his Talent allows him to launch powerful Follow-Up Attacks whenever attacking enemies affected by debuffs. Leveling these two traces significantly increases his overall DPS and the consistency of his Follow-Up Attacks.

Dr. Ratio's Ultimate is also a high priority. It deals substantial Imaginary damage to a single enemy and enhances his ability to capitalize on debuffed targets. Upgrading the Ultimate improves its damage scaling, making it an important part of his burst damage during key moments in battle.

Dr. Ratio's Basic ATK is the lowest priority. It is rarely used in his optimal rotations and mainly serves as a way to generate Skill Points when necessary. Instead, it is more beneficial to focus on unlocking his Bonus Traces, which provide valuable stat boosts such as increased CRIT Rate and CRIT DMG when attacking debuffed enemies, further strengthening his Follow-Up Attack playstyle.

Dr. Ratio Best Light Cones

To select the ideal Light Cone for Dr. Ratio, evaluate your build against these three tactical needs rather than simply choosing by rarity:

Maximizing Follow-Up Attack Damage: A large portion of Dr. Ratio’s damage comes from his Talent, which allows him to perform powerful Follow-Up Attacks against debuffed enemies. Because of this, Light Cones that increase CRIT Rate, CRIT DMG, or directly boost Follow-Up Attack damage will significantly improve his overall damage output and consistency during battle.
Maintaining High CRIT Consistency: Dr. Ratio benefits greatly from maintaining a strong CRIT ratio. Since his Follow-Up Attacks can trigger frequently when enemies have multiple debuffs, having reliable CRIT Rate and CRIT DMG ensures that these additional attacks deal maximum damage. If your relics lack sufficient CRIT stats, prioritize Light Cones that help stabilize his CRIT consistency.
Enhancing Single-Target Burst Potential: As a Hunt character, Dr. Ratio specializes in dealing high single-target damage, making him extremely effective against bosses and elite enemies. Light Cones that increase overall damage dealt, Skill damage, or provide additional offensive buffs will further amplify his burst potential and allow him to eliminate priority targets more efficiently.

Recommended Light Cone
Baptism of Pure Thought (5★)	ATK: 582 \| DEF: 529 \| HP: 952 Skill (S1): Increases the wearer's CRIT DMG by 20% / 23% / 26% / 29% / 32% . For every debuff on the enemy target, the wearer's CRIT DMG dealt against this target additionally increases by 8% / 9% / 10% / 11% / 12% , stacking up to 3 times. When using Ultimate to attack the enemy target, the wearer receives the "Disputation" effect, which increases DMG dealt by 36% / 42% / 48% / 54% / 60% and enables their Follow-Up ATKs to ignore 24% / 28% / 32% / 36% / 40% of the target's DEF. This effect lasts for 2 turns.
Worrisome, Blissful (5★)	ATK: 582 \| DEF: 529 \| HP: 952 Skill (S1): Increase the wearer's CRIT Rate by 18% / 21% / 24% / 27% / 30% and increases DMG dealt by Follow-Up ATK by 30% / 35% / 40% / 45% / 50% . After the wearer uses a Follow-Up ATK, inflicts the target with the "Tame" state, stacking up to 2 time(s). When allies hit enemy targets under the "Tame" state, each "Tame" stack increases the CRIT DMG dealt by 12% / 14% / 16% / 18% / 20%.
Cruising in the Stellar Sea (5★)	ATK: 529 \| DEF: 463 \| HP: 952 Skill (S1): Increases the wearer's CRIT Rate by 8% / 10% / 12% / 14% / 16% , and increases their CRIT Rate against enemies with HP percentage 50% or less by an extra 8% / 10% / 12% / 14% / 16% . When the wearer defeats an enemy, their ATK is increased by 20% / 25% / 30% / 35% / 40% for 2 turn(s).
See You at the End (4★)	ATK: 529 \| DEF: 396 \| HP: 952 Skill (S5): Increases the wearer's CRIT DMG by 40%. The Skill DMG and Follow-up ATK DMG dealt by the wearer increase by 40%.

Dr. Ratio Relics, Ornaments & Stats Priority

1. Relics

The 4-piece Pioneer Diver of Dead Waters set stands as the absolute best choice for Dr. Ratio, providing powerful bonuses that increase his damage against debuffed enemies and perfectly complement his Follow-Up Attack playstyle. If you haven't farmed a full set of that yet, the 4-piece Wastelander of Banditry Desert is an excellent second-best alternative, especially for teams that can consistently apply debuffs and trigger additional CRIT bonuses against affected enemies. Finally, for players looking for a more flexible build, a 2-piece hybrid of Pioneer Diver of Dead Waters and The Ashblazing Grand Duke is a fantastic third option that balances Follow-Up Attack damage with consistent offensive stats.

Best Choice
1st	Pioneer Diver of Dead Waters	2-Pc: Increases DMG dealt to enemies with debuffs by 12%. 4-Pc: Increases CRIT Rate by 4%. The wearer deals 8%/12% increased CRIT DMG to enemies with at least 2/3 debuffs. After the wearer inflicts a debuff on enemy targets, the aforementioned effects increase by 100%, lasting for 1 turn(s).
Alternative Choice
2nd	Wastelander of Banditry Desert	2-Pc: Increases Imaginary DMG by 10%. 4-Pc: When attacking debuffed enemies, the wearer's CRIT Rate increases by 10%, and their CRIT DMG increases by 20% against Imprisoned enemies.
3rd	The Ashblazing Grand Duke	2-Pc: Increases follow-up attack DMG by 20%. 4-Pc: When the wearer uses follow-up attacks against the target enemy, increase the wearer's ATK by 6% for every time the follow-up attack deals DMG. This effect can stack for a maximum of 8 times and lasts for 3 turns. This effect is removed the next time the wearer uses a follow-up attack.

2. Planar Ornaments

Duran, Dynasty of Running Wolves is the top Planar choice, increasing the wearer's Follow-Up ATK DMG and granting additional CRIT DMG stacks when allies perform Follow-Up Attacks. Inert Salsotto is a great alternative, providing 8% CRIT Rate and increasing Follow-Up ATK and Ultimate DMG once you reach the required CRIT Rate threshold. For more general offensive stats, Rutilant Arena offers increased CRIT Rate and boosts Basic ATK and Skill DMG once the CRIT requirement is met.

Recommended Planar Ornaments
Duran, Dynasty of Running Wolves	2-Pc: When an ally character uses a Follow-Up ATK, the wearer gains 1 stack of "Merit," stacking up to 5 time(s). Each stack of "Merit" increases the DMG dealt by the wearer's Follow-Up ATKs by 5%. When there are 5 stacks, additionally increases the wearer's CRIT DMG by 25%.
Inert Salsotto	2-Pc: Increases the wearer's CRIT Rate by 8%. When the wearer's current CRIT Rate reaches 50% or higher, the DMG dealt by the wearer's Ultimate and Follow-Up ATK increases by 15%.
Rutilant Arena	2-Pc: Increases the wearer's CRIT Rate by 8%. When the wearer's current CRIT Rate reaches 70% or higher, DMG dealt by Basic ATK and Skill increases by 20%.

3. Stats Priority

Main Stats
Body	CRIT Rate / CRIT DMG
Feet	SPD / ATK%
Planar Sphere	Imaginary DMG Boost
Link Rope	ATK%
Sub-Stats Priority
CRIT Rate > CRIT DMG > SPD > ATK

Dr. Ratio Best Team Recommendation

If you want a DPS who excels at eliminating priority targets, he's an absolute game-changer. He perfectly fits debuff-focused teams by consistently triggering powerful Follow-Up Attacks against enemies affected by multiple debuffs. His Talent acts as the core of his damage, allowing him to repeatedly strike enemies with additional Imaginary damage whenever the conditions are met. Even outside those specific teams, his reliable Follow-Up Attack damage and strong CRIT scaling make him an incredibly comfortable, offensive-minded pick for many single-target focused lineups.

Follow-Up Attack Teams

Main DPS

Sub DPS

Support

Sustain

Dr. Ratio (5★)

Topaz (5★)

Robin (5★)

Aventurine (5★)

Dr. Ratio (5★)

Topaz (5★)

Ruan Mei (5★)

Fu Xuan (5★)

Debuff-Based Hypercarry Teams

Main DPS

Support 1

Support 2

Sustain

Dr. Ratio (5★)

Silver Wolf (5★)

Pela (4★)

HuoHuo (5★)

Dr. Ratio (5★)

Sunday (5★)

Robin (5★)

Aventurine (5★)

Dr. Ratio Eidolons

Eidolon Performance

Eidolon	Rating	Explanation
E1	★★★★☆	Consistency Boost. Each time Dr. Ratio uses his Skill to attack a debuffed enemy, he gains a stack that increases his CRIT DMG for the rest of the battle. This greatly improves his overall scaling and makes his Follow-Up Attacks deal significantly more damage in longer fights.
E2	★★★★★	Massive Damage Spike. When Dr. Ratio’s Talent triggers a Follow-Up Attack, enemies take increased damage from those attacks. This dramatically amplifies his main damage source and makes his Follow-Up Attack rotations far more lethal against priority targets.
E4	★★★☆☆	Energy Flow Improvement. After using his Ultimate, Dr. Ratio regenerates additional Energy, helping him cycle his Ultimate more consistently during extended encounters. While useful, it provides less direct damage compared to his other key Eidolons.
E6	★★★★★	Follow-Up Overdrive. Dr. Ratio’s Follow-Up Attacks deal massively increased damage and can trigger additional attacks against marked targets, allowing him to unleash devastating burst damage in optimized debuff teams. This Eidolon unlocks his maximum DPS ceiling.

Eidolon Effect

Eidolon

Effect

"Pride Comes Before a Fall"

The maximum stackable count for the Trace "Summation" increases by 4. When a battle begins, immediately obtains 4 stacks of Summation. Needs to unlock Summation first.

"The Divine Is in the Details"

When his Talent's Follow-Up ATK hits a target, for every debuff the target has, deals Imaginary Additional DMG equal to 20% of Dr. Ratio's ATK. This effect can be triggered for a maximum of 4 time(s) during each Follow-Up ATK.

"Know Thyself"

Ultimate Lv. +2, up to a maximum of Lv. 15.Basic ATK Lv. +1, up to a maximum of Lv. 10.

"Ignorance Is Blight"

When triggering the Talent, additionally regenerates 15 Energy for Dr. Ratio.

"Sic Itur Ad Astra"

Skill Lv. +2, up to a maximum of Lv. 15.Talent Lv. +2, up to a maximum of Lv. 15.

"Vincit Omnia Veritas"

Additionally increases the trigger count for "Wiseman's Folly" by 1. The DMG dealt by the Talent's Follow-Up ATK increases by 50%.

Conclusion

Dr. Ratio is much more than your average Hunt DPS; he is a powerful single-target damage dealer who truly finds his stride in debuff-focused team compositions. His kit is built around his Talent and powerful Follow-Up Attacks, which essentially allow him to continuously pressure enemies that are affected by debuffs while dealing massive Imaginary damage. By focusing on his CRIT Rate, CRIT DMG, and Follow-Up Attack damage stats, you ensure his Talent triggers consistently while keeping his damage output high throughout the battle.

In the heat of endgame content, Dr. Ratio stands out because he provides incredibly reliable single-target damage while synergizing extremely well with debuff-focused supports that help activate his Talent more frequently. To take your Dr. Ratio to the next level and strengthen your team, consider topping up Honkai: Star Rail through LootBar. Their platform offers a safe and convenient way to get the Oneiric Shards you need for Characters or Eidolons at significantly lower prices. Don't miss out on maximizing your account's potential. Head over to LootBar and prepare your squad for the toughest challenges!

Honkai: Star Rail Dr. Ratio Build Guide: Light Cones, Relics, Best Teams

Dr. Ratio Character Overview

Dr. Ratio Information

Dr. Ratio Gameplay

Dr. Ratio Trace Priority

Dr. Ratio Best Light Cones

Dr. Ratio Relics, Ornaments & Stats Priority

1. Relics

2. Planar Ornaments

3. Stats Priority

Dr. Ratio Best Team Recommendation

Follow-Up Attack Teams

Debuff-Based Hypercarry Teams

Dr. Ratio Eidolons

Eidolon Performance

Eidolon Effect

Conclusion